The mean lifetimes of levels in ${}_{}{}^{59}{}_{}{}^{}\mathrm{Cu}$ below 3.6 MeV have been investigated with the Doppler-shift attenuation method and the ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}({}_{}{}^3{}_{}{}^{}\mathrm{He},d){}_{}{}^{59}{}_{}{}^{}\mathrm{Cu}$ reaction at 11.6 MeV. Scattered particles were detected in two $E-\Delta E$ telescopes at ± 55° with respect to the beam axis, in coincidence with $\gamma$ rays observed at 90° in a 50-${\mathrm{cm}}^3$ Ge(Li) detector. New levels were observed at 3114 and 3615 keV. Mean lifetimes are reported for the following levels (energy in keV, lifetime in fs): 491 (830 ± 300), 914 (> 1600), 1399 (570 ±240), 2266 (310 ± 140), 2324 (36 ±5), 3043 (1150 ± 500), 3114 (20 ± 11), 3130 (10 ± 4), 3551 (< 15), 3580 (2400 ± 1400), and 3615 (< 35). The experimental results are compared with the predictions of a core-particle coupling calculation.

[NUCLEAR REACTIONS ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}({}_{}{}^3{}_{}{}^{}\mathrm{He},d\gamma )$, $E_{{}_{}{}^3{}_{}{}^{}\mathrm{He}}=11.6\mathrm{}$ MeV; measured $E_{\gamma }\left(\theta \right)$, Doppler-shift attenuation, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Cu}$ deduced levels, $T_{\frac{1}{2}}$. Enriched target, Ge(Li) detector.]

• Received 25 February 1974

DOI:https://doi.org/10.1103/PhysRevC.9.2193